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Finding the Fourth Proportional to 386.32, 532.20 and 319.50

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Solution

The fourth proportional to 386.32, 532.20 and 319.50 is: 440.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.32 : 532.20 = 319.50 : x
  2. Step 2: Convert to fraction form
    386.32/532.20 = 319.50/x
  3. Step 3: Cross multiply
    386.32x = 532.20 × 319.50
  4. Step 4: Simplify right side
    386.32x = 170,037.90
  5. Step 5: Solve for x
    x = 170,037.90/386.32
  6. Step 6: Final answer
    x = 440.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.